<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <input type="text" placeholder="number" id="number">
    <button id="btn">计算</button>
</body>
<script>
    var input = document.getElementById("number");
    var btn = document.getElementById("btn");
    btn.onclick = function(){
        
        var worker = new Worker("worker.js");
        worker.postMessage(input.value);
        worker.onmessage = function(event){
            alert(event.data);
        };
    }
</script>
</html>